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Heit, A.* ; Gebhardt, F.* ; Lahl, K.* ; Neuenhahn, M.* ; Schmitz, F.* ; Anderl, F.* ; Wagner, H.* ; Sparwasser, T.* ; Busch, D.H. ; Kastenmüller, K.

Circumvention of regulatory CD4(+) T cell activity during cross-priming strongly enhances T cell-mediated immunity.

Eur. J. Immunol. 38, 1585-1597 (2008)
DOI
Open Access Green as soon as Postprint is submitted to ZB.
Immunization with purified antigens is a safe and practical vaccination strategy but is generally unable to induce sustained CD8(+) T cell-mediated protection against intracellular pathogens. Most efforts to improve the CD8(+) T cell immunogenicity of these vaccines have focused on co-administration of adjuvant to support cross-presentation and dendritic cell maturation. In addition, it has been shown that CD4(+) T cell help during the priming phase contributes to the generation of protective CD8(+) memory T cells. In this report we demonstrate that the depletion of CD4(+) T cells paradoxically enhances long-lasting CD8-mediated protective immunity upon protein vaccination. Functional and genetic in vivo inactivation experiments attribute this enhancement primarily to MHC class II-restricted CD4(+) regulatory T cells (Treg), which appear to physiologically suppress the differentiation process towards long-living effector memory T cells. Since, in functional terms, this suppression by Treg largely exceeds the positive effects of conventional CD4(+) T cell help, even the absence of all CD4(+) T cells or lack of MHC class II-mediated interactions on priming dendritic cells result in enhanced CD8(+) T cell immunogenicity. These findings have important implications for the improvement of vaccines against intracellular pathogens or tumors, especially in patients with highly active Treg.
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Publication type Article: Journal article
Document type Scientific Article
Keywords CD8+ T cells; Cross-priming; Protective immunity; Regulatory T cells
ISSN (print) / ISBN 0014-2980
e-ISSN 1521-4141
Journal European Journal of Immunology
Quellenangaben Volume: 38, Issue: 6, Pages: 1585-1597 Article Number: , Supplement: ,
Publisher Wiley
Publishing Place Hoboken
Reviewing status Peer reviewed
Institute(s) Institute of Virology (VIRO)